The Noark surge protective device line consists of class 2 devices. They are designed to protect against surges caused by fast transient switching operations or indirect lightning strikes. It is recommended to install the devices every 10 - 20 m of cable length, in main switchboards as well as sub-distribution boards. The Ex9UE2 20 440 is designed for coordination with the class 1 Ex9UE1 35 line; for the Ex9UE2 20 275, coordination with the Ex9UE1 35 line is achieved using a 10 m cable. The design of Ex9UE2 arresters is based on varistor elements. It ensures a fast response time. The modular design with a replaceable insert allows for quick and easy replacement of functional modules if they burn out due to frequent occurrence of surge peaks.
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